Carbon oxide capture

Patent metadata

Field	Value
Publication number	US-9409118-B2
Application number	US-201113879872-A
Country	US
Kind code	B2
Filing date	Oct 18, 2011
Priority date	Oct 18, 2010
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

The present invention relates to the use of (poly)-oxymethylene dialkyl ethers as agents for capturing carbon oxides, CO and/or CO 2 .
The invention also relates to the process for capturing carbon oxides using at least one absorption agent chosen from said (poly)oxymethylene dialkyl ethers.

First claim

The invention claimed is:

1. A process for capturing carbon oxides, comprising at least one step of bringing a gas stream comprising at least one carbon oxide into contact with a trapping agent comprising at least one compound of formula (1) as follows:
X—(OCR 2 ) n —OX′  (1)

wherein
n is an integer between 2 and 20, limits included,
X and X′ may be identical or different and represent a C m H 2m+1 radical with m between 1 and 20, limits included, and
R represents hydrogen or the C m H 2m+1 radical with m between 1 and 20, limits included.

2. The process of claim 1 , wherein the gas stream has a content of carbon oxides within the range extending from 1% to 100% by volume.

3. The process of claim 1 , wherein the ratio of the compound of formula (1) to the carbon oxide is between 0.1 and 0.33 kg per liter at 25° C. under 0.1 MPa.

4. The process of claim 1 , wherein at least one compound of formula. (1) is selected from the group consisting of (i) CH 3 —(OCH 2 ) n —OCH 3 , where n is an integer between 2 and 8, limits included, (ii) CH 3 —(OCH 2 ) n —OCH 3 , where n is an integer between 2 and 4, limits included, and (iii) CH 3 —(OCH 2 ) n —OCH 3 , where n is an integer between 4 and 8, limits included.

5. The process of claim 1 , wherein the trapping agent is at least one compound of formula (1), where the X and X′ radicals are identical.

6. The process of claim 1 , wherein the trapping agent is at least one compound of formula (1) where the R radicals represent a hydrogen atom.

7. The process of claim 1 , wherein the trapping agent is at least one compound of formula X—(OCH 2 ) n —OX, where X and n are as defined in claim 1 .

8. The process of claim 1 , wherein the trapping agent is at least one compound selected from the group consisting of CH 3 —(OCH 2 ) 2 —OCH 3 , CH 3 —(OCH 2 ) 3 —OCH 3 , CH 3 —(OCH 2 ) 4 —OCH 3 , CH 3 —(OCH 2 ) 5 —OCH 3 , CH 3 —(OCH 2 ) 6 —OCH 3 , CH 3 —(OCH 2 ) 7 —OCH 3 , CH 3 —(OCH 2 ) 8 —OCH 3 , C 2 H 5 (OCH 2 ) 2 —OC 2 H 5 , C 2 H 5 —(OCH 2 ) 3 —OC 2 H 5 , C 2 H 5 —(OCH 2 ) 4 —OC 2 H 5 , C 2 H 5 —(OCH 2 ) 5 —OC 2 H 5 , C 2 H 5 —(OCH 2 ) 6 —OC 2 H 5 , C 2 H 5 —(OCH 2 ) 7 —OC 2 H 5 , C 2 H 5 —(OCH 2 ) 8 —OC 2 H 5 , and mixtures thereof in any proportions.

9. The process of claim 1 , wherein the at least one compound of formula (1) may be used alone or as a mixture with one or more solvents.

10. The process of claim 1 , wherein n is from 2 to 8.

11. The process of claim 1 , wherein m is from 1 to 10.

12. The process of claim 1 , wherein the carbon oxide is CO and/or CO 2 .

13. The process of claim 12 , wherein the carbon oxide is CO 2 .

14. The process as defined in claim 2 , wherein the content of carbon oxides ranges from 1 to 90% by volume.

15. The process of claim 14 , wherein the content of carbon oxides ranges from 1 to 50% by volume.

16. A continuous process for capturing carbon oxides, CO and/or CO 2 , comprising alternately and consecutively:
at least one step of bringing a gas stream comprising at least one carbon oxide into contact with at least one compound of formula (1) as defined in claim 1 , as a solvent for absorbing said carbon oxide, and
at least one step of regenerating the absorption solvent by reducing the pressure of the enriched solvent and/or increasing the temperature of the enriched solvent.

Assignees

• Plee Dominique
• Fremy Georges
• Arkema France

Inventors

• Plee Dominique
• Fremy Georges

Classifications

• C01B2203/0475

  the impurity being carbon dioxide · CPC title

• C10K1/18

  hydrocarbon oils {(C10K1/165 takes precedence)} · CPC title

• Y02P20/152

  Cross-Sectional Technologies · mapped topic

• B01D2258/0283

  Flue gases · CPC title

• B01D2252/2025

  Ethers or esters of alkylene glycols, e.g. ethylene or propylene carbonate · CPC title